Emotional Abuse

I am 25 years old and I have a two year old daughter and another baby on the way,my husband is a very big emotional Abuser,he has zero respect for me,and am super depressed,his family are terrible and they leave here,I want to leave my marriage after I give birth but I don’t know what to do,he married me from Africa and brought me here for three years,I don’t have friends or family here,am all alone..please I need Advice??